Cell Structure and Function

1
Cell Structure and Function

• Cell Theory

2
The Cell Theory

• Robert Hooke
• 1665
• Microscopic View of Cork
• Started Scientists Searching for Cells

3
The Cell Theory

• Anton van Leeuwenhoek
• Late 1674
• First Microscope
• First Time MicroscopicOrganisms Observed

4
The Cell Theory

• 1838 Matthias Schleiden
• Plants made of cells
• 1839 Theodor Schwann
• Animals made of cells
• 1855 Rudolph Virchow
• Cells come from existing cells
• Completes Cell Theory

5
The Cell Theory

• Key Concept
• Cell Theory
• All living things are composed of cells
• Cells are the basic units of structure and
  function
• New cells are produced from existing cells

6
Prokaryotes Eukaryotes

• Key Concept
• Biologists divide cells into two categories
  Prokaryotes Eukaryotes

DNA Nucleus
Prokaryotes YES NO
Eukaryotes YES YES
7
Prokaryotes
8
Prokaryotes

• Usually smaller and simpler
• Do have Cell Membranes and Cytoplasm
• Do NOT have Nuclei
• Includes ALL Bacteria

9
Eukaryotes
10
Eukaryotes

• Do contain
• Nuclei, Cell Membrane Cytoplasm Organelles
• Many Single celled organisms
• All multicellular organisms are Eukaryotes
• Includes ALL
• plants, animals fungi

11
Basic Cell Structures

• Cells are typically between 5-50 micrometers
• 1 micrometer 1 millionth of a meter
• AKA micron
• Can be seen with light microscopes
• All have a Cell Membrane Cytoplasm